A small number Dfx v4 users have experienced a problem where FCPX does not display the Dfx filter parameters. This is a problem associated with 10.13 and the macOS not properly registering the plug-ins, so the parameters don't show up. It may be fixed by doing the following:

- Close FCPX- Go to /Applications/Tiffen/Dfx v4.0- Double-click on DfxFxPlugFilter- Click Open if prompted- Quit the DfxFxPlugFilter that opens

If the parameters do not show up, Apple recommends a clean install of the OS. Alternatively, you can upgrade to the successor to Dfx, named DFT v1 which does not exhibit the problem.